\documentclass{article}
\usepackage{agda}

\begin{document}

\AgdaHide{
\begin{code}%
\>[0]\AgdaKeyword{postulate}\AgdaSpace{}%
\AgdaPostulate{A}\AgdaSpace{}%
\AgdaSymbol{:}\AgdaSpace{}%
\AgdaPrimitiveType{Set}\<%
\end{code}}

\end{document}
